Which myotome corresponds to elbow extension and wrist flexion?

The myotome that corresponds to elbow extension and wrist flexion is C7. This level innervates several muscles responsible for these movements. Elbow extension is primarily facilitated by the triceps brachii, which is innervated by the radial nerve, branching from the C7 segment.

Wrist flexion, while more commonly associated with C6, is also influenced by C7, as certain muscles involved in wrist flexion, like the flexor carpi radialis and part of the flexor digitorum superficialis, are innervated by this segment. This dual involvement in both movements at the C7 level makes it the correct association for the activities listed in the question.

Alternatively, C6 largely focuses on wrist extension and hand grasp functions, while C8 primarily innervates muscles relevant to finger flexion and gripping actions, and T1 is associated with intrinsic muscles of the hand, which also do not directly contribute to elbow extension. Therefore, C7 stands as the correct choice for the combination of elbow extension and wrist flexion.